620 – HIHI Current Heat Value of Fuel
Yellow alarm.
Associated parameter 2.1210.009
Cause
Corrective action
Fuel calorific value has
undershot the second limit
value.
u
Check gas quality if feasible.
621 – LO NOx Value
Yellow alarm.
Associated parameter 2.3050.024
Cause
Corrective action
NOx emissions have undershot
the first limit value.
1. Check gas quality if feasible.
2. Check gas pressure.
3. Check NOx sensor.
4. Check emissions.
622 – LOLO NOx Value
Yellow alarm.
Associated parameter 2.3050.025
Cause
Corrective action
NOx emissions have undershot
the second limit value.
1. Check gas quality if feasible.
2. Check gas pressure.
3. Check NOx sensor.
4. Check emissions.
623 – HI NOx Value
Yellow alarm.
Associated parameter 2.3050.026
Cause
Corrective action
NOx emissions have exceeded
the first limit value.
1. Check gas quality if feasible.
2. Check NOx sensor.
3. Check emissions.
624 – HIHI NOx Value
Yellow alarm.
Associated parameter 2.3050.027
Cause
Corrective action
NOx emissions have exceeded
the second limit value.
1. Check gas quality if feasible.
2. Check NOx sensor.
3. Check emissions.
MS150115/00E 2013-10
| Troubleshooting | 121
TIM-ID: 0000044738 - 001